| title | ISBN-13 (ISBN-10) | year of publica- tion |
|---|---|---|
| Mediæval Popes, Emperors, Kings, and Crusaders; or, Germany, Italy, and Palestine, from A.D. 1125 to A.D. 1268: Volume 1 | 978-1-4021-7803-0 (1-4021-7803-4) | 2002 |
| Mediæval Popes, Emperors, Kings, and Crusaders; or, Germany, Italy, and Palestine, from A.D. 1125 to A.D. 1268: Volume 3 | 978-1-4021-7790-3 (1-4021-7790-9) | 2002 |
| Mediæval Popes, Emperors, Kings, and Crusaders; or, Germany, Italy, and Palestine, from A.D. 1125 to A.D. 1268: Volume 4 | 978-1-4021-7572-5 (1-4021-7572-8) | 2002 |